Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 36
Fig. 25.—Making Magnetic Field of a Bar Magnet. nent record of the magnetic field, a piece of paraffin-coatedpaper is used in place of the cardboard. After the field is … Fig. 26.—Magnetic Field Between Unlike Poles. 18 PRACTICAL ELECTRICITY. produced, the flame of a Bunsen burner is gently applied,heating the paraffin, which upon cooling fixes the iron fil- \ \ f / / / / S ^ .h ^ Jhsn^tie^jixk ^ S- riVr 4 \ -1 Fig. 27.—Bar Magnet. ings to the paper. Paraffin paper…
Electricity · Magnetism
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